poppin/boot/multiboot.s

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%define VIDEO_MODE 1
section .data
global __VIDEO_MODE
__VIDEO_MODE: db VIDEO_MODE
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section .multiboot_header
header_start:
dd 0xe85250d6 ; magic number (multiboot 2)
dd 0 ; architecture 0 (protected mode i386)
dd header_end - header_start ; header length
; checksum
dd 0x100000000 - (0xe85250d6 + 0 + (header_end - header_start))
; insert optional multiboot tags here
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%if VIDEO_MODE
dw 5 ; type
dw 1 ; flags
dd 20 ; size
dd 0 ; width
dd 0 ; height
dd 24 ; depth
; grub 2 expects 8 byte alignment
dw 0 ; padding
dw 0 ; padding
%endif
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dw 0 ; type
dw 0 ; flags
dd 8 ; size
header_end: